Mounting for percussive tools



Jan. 17, 1928.

G. G. TUTTLE MOUNTiNG FOR P ERCUSSIVE TOOLS Filed J1'11yl5, 1926 Patented l7, 19233.

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5ER$EQ ASSZGH 01? TO INGERSOLL-RAND COMYANY, OF JERSEY CITY, new JERSEY, A CQR-POBATION OF NEW JERBEY.

MOUNTING FQR- PEBCUSSIVE TOOLS.

Application filed July 15,

This invention relates to mountings for percussive tools, but more particularly to a mounting for a tluid actuated rock drill oi the hammer type styled a concrete or paving r. breaker.

The objects of the invention are to enable a concrete breaker or similar tool to be mounted on a portable carriage in a simple and convenient manner, and permit the tool 1:; to be counterbalanced by a pressure fluid device, so that the work required of the operator is lightened and made easier.

Other objects of the invention are to secure simple pressure fluid means for adjusting the position and height of the tool to accommodate the tool for various classes and conditions of work, and locate the control of both the counterbalancing means and the tool itself in a convenient position for manual manipulation by the operator.

Further objects of the invention will hereinafter appear, and the invention consists of the combinations of elements and ar rangement of parts having the general mode of operation substantially as hereinafter described and claimed in this specification and shown in their preferred form in the accompanying drawings, in which Figure l is a vertical perspective view of a mounting partly in vertical section, and

Figure 2 is a detailed View of the upper arm partly in horizontal section on the line 22 of Figure 1 looking in the direction of the arrows.

tei'ferring to the drawings, the ll-shaped frame A is mounted on suitable rollers or casters B and rigidly attached to this frame is a post C shown in this instance as solid. The bore D of the vertical hollow post .ldl l tits slidably over the solid post (l. The-post It supports the horizontal. arm F and is held rigidly vertical by the brace l. Upon the arm it) is mounted the saddle ll having the rollers J which enable the saddle to move freely on the arm F. In the lower part of the saddle H are mounted two sheaves K, only one of which is shown. A stop piece L is secured to the outer end of the arm F for limiting the outward longitudinal movement of the saddle H.

Mounted on the vertical post E by means of the collar M is the cylinder N having the piston O with the piston rod P therein. Fixed to the outer end of the piston rod P 5 is the pulley Q having the sheave R. The

1326. serial no. 122,631.

guide sheave S is mounted at the upper closed end of the cyl nder N and on an outwardly extending portion of the collar M.

The percussive tool or concrete breaker T has the front head U holding the drill steel V, the handle "W and the hand throttle X. The inlet Y of the tool is provided. with the T-shaped connection 25 having the motive tiuid supply pipe (4 and the valve Z) attached to its outwardly extending arms 0 and (Z. F7 The valve 5 has the movable member a; operated by the handle 7; the inlet passage 9, the exhaust passage 71 and the motive fluid supply pipe connection j.

interposed between the connection j of the valve 7) and the connection 7; of the cylinder N is the supply pipe is which conducts motive fluid from the connection j to the point In to operate the piston O. r

The cable 71, secured to the stop piece L, 73 passes over one sheave K, downward around the sheave o, upward through the second sheave at K, then along the arm F through sheave S, downward and around sheave R and is secured to the lower end of cylinder N at p.

Referring to Figure 2, the arm F is rotatably mounted upon the bolt 9 which passes through the split end of the collar 1 securing the collar r to the bushing a l/Vhile the arm f1 F is in use it is held rigidly at right angles to the post E by the step t and the pin a. The helical spring 4) holds the pin a in place.

When a heavy tool is in use the workman finds it difficult to support the weight of the tool and to move it from place to place, but with the apparatus described above substantially all of the weight of the toolis supported by the arm l through the cable It and the workman is free to give his attention and strength to guiding the tool. When it becomes necessary to move the tool he does so by turing the handle 7 until a tree lilrlSSitlIQ for motive fluid is obtained, from the inlet r to the point Z2. Pressure is thus exerted l upon the piston O and it is forced downward thus raising the tool. The arm F may then be swung to any desired position except that it is limited in its swin g by the stops to which prevent the arm F from taking such a posi- 3 tion that the combined weight of the arm F and tool T might upset the apparatus.

The mounting is disassembled by removing the percussive tool, drawing pina from the hole a: in the arm. The arm then swings lib downward about the bolt 9 and takes a position parallel to the post N. The pin y is removed and the arm F, cylinder N and post E may be lifted from post C as a unit.

I claim:

In a mounting for a fluid actuated rock drill, the combination of a portable carriage having a U shaped frame supported on wheels, a demountable, upright support, a horizontal arm adjustable on said upright support, a saddle having a pulley, said sad- (lle traveling on said horizontal arm, a cylinder connected to the rearward end of said arm, a piston in said cylinder, a piston rod having a pulley attached thereto, a cable ward end of the cable being connected to the cylinder, at sheave carried by the said loop, means for supporting a percussive tool on said sheave, means for supplying pressure fluid to the cylinder, whereby the weight of the tool may be eonnterbalaueml by the prcz-rsure in the cylinder and the tool may be adjusted 'ertically to the Work.

In testimony whereof I have signed this specification.

GROVER G. TUTTLE. 

